make Exractor fields private

src/extractor.rs

@@ -2,9 +2,9 @@ use anyhow::{bail, Context, Result};
 use scraper::{ElementRef, Html, Selector};
 
 pub(crate) struct Extractor {
-    pub time: Selector,
+    time: Selector,
-    pub departure: Selector,
+    departure: Selector,
-    pub delay: Selector,
+    delay: Selector,
 }
 
 impl Extractor {